Method for obtaining correction value, liquid ejecting device

A liquid ejecting device,

• wherein a correction value is stored,
• a gray-scale value expressed by a pixel of image data to be printed is corrected by the correction value and liquid is ejected on the basis of the corrected gray-scale value, and
• the correction value is obtained by:
• forming a first test pattern configured to include a plurality of pixel rows, each of which has a plurality of pixels arrayed in a predetermined direction, arrayed in a direction crossing the predetermined direction;
• obtaining a first read gray-scale value for every pixel row by making a scanner read the first test pattern;
• calculating a first correction value for every pixel row on the basis of the first read gray-scale value;
• forming a second test pattern, which is configured to include the pixel rows arrayed in the crossing direction, using the first correction value;
• obtaining a second read gray-scale value for every pixel row by making the scanner read the second test pattern;
• a step of calculating a correction amount for every pixel row on the basis of the first read gray-scale value and the second read gray-scale value;
• and
• a step of calculating a second correction value of the certain pixel row on the basis of the correction amount of the pixel row and the correction amount of the pixel row adjacent to the pixel row.